The distribution of transition-metal ions between the tetrahedraland the octahedral sites in franklinite has been determined by observing the 55Mn and 57Fe nuclear magnetic resonance at 1.6 K, using the spin-echo method. Spectra have been interpreted by comparison with manganese ferrite spectra. From the dependence of resonance frequency on the external magnetic field, the Mn2+ ions were determined to be at the tetrahedral sites, while the Fe3+ions are at the octahedral sites. Considering the Mn3+ ions to be located at the octahedral sites, the cation distribution formula is Zn0.612+Mn0.392+[Mn0.063+Fe1.943+]O4 neglecting minor components.

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